You might want to buy your manufactures mags, I bought one for my 9mm 1911 and it would not lockup, bought one from manufacturer and it worked perfect.
...Do not run any magazines through a 1911 that are not made by Wilson Combat.
You're not likely to find these on the second hand market, and new ones are on sale at the moment:
http://shopwilsoncombat.com/mobile/...Size-10-Round-ETM-Base-Pad/productinfo/500-9/
...
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